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(Modem R. H. GUYER. A ARTIFICIAL STONE PAVEMENT AND BLOCK.

Patented July 19, 1881.

- UNITED STATES RICHARD H. GUY-ER, OF LA FAYETTE,

PATENT OFFICE? INDIANA, ASSIGNOR OF TWO-THIRDS TO EDWARD ASHER AND ADAMHERZOG, OF SAME PLACE.

- ARTIFICIAL-STONE PAVEMENT AND BLOCK.

SPECIFICATION forming part of Letters Patent NO. 244,594, dated July19,1881. Application filed February 10, 1381. (Model To all whom it mayconcern Be it known that I, RICHARD H. GUYER, of La Fayette, in thecounty of Tippecanoe, and in the State of Indiana, haveinvented certainnew and useful Improvements in Artificial- Stone Pavement-Blocks; and Ido hereby declare that the following is a full, clear, and exactdescription thereof, reference being-had to the accompanying drawings,and to the letters of reference marked thereon, making a part of thisspecification.

The present invention relates to a novel mode of connecting thepaving-blocks of pavements in which the blocks are made of some suitablecomposition.

Paving-blocks of this character have beenconnected bytongue-and-groovejoints; but I have found that the horizontal groovestend to weaken the blocks at their edges, that the tongues frequentlybreak, and that in case of any irregularity in the formation of eitherthe tongue or the groove a close fit between the two is rendereddifficult.

It is the object of my invention to overcome such defects; and to thisend I form semispherica-l cavities in one block a nd correspondin gsemi-spherical projections in the opposing side of another block,whereby the blocks can be readily and effectively connected together byfitting the projections in the said cavities.

In the drawings, Figure l is a section taken on a vertical plane throughtwo paving-blocks formed and connected together in accordance with myimprovement. Fig. 2 is a section 3 5 taken on a vertical plane throughone of the said blocks.

A A indicate the paving-blocks, oi any suit able composition. Each blockis formed with the semi-spherical cavities B B in two of its sides andwith the semi-spherical projections (J (J on its remaining two sides,said projections being adapted to fitinlo the recesses, as shown inFig. 1. This arrangement of cavities and projections admits of all ofthe blocks being fitted together in laying a pavement. 5 In the ease ofa horizontal tongue fitting in a horizontal groove there can be noinclination of one block with respect to the block to which it is to beconnected in case the tongue or groove should not be in a rightline; butshould so it happen that the centers of the cavities or projections inmy blocks are not both in a plane parallel with the top or bottom of theblock, it is evident that the block could be slightly inclined, andtherebyfit the opposite block.

What I claim is- A rectangular paving-block provided on two of itsadjoining sides with semi-spherical projections U and on the oppositeadjoining sides with corresponding recesses B, whereby a se- 60 riesofsaid blocks may be mutuallyinterlocked, substantially as specified.

In testimony that I claim the foregoing I have hereunto set my hand this3d day of Jannary, 1881.

RICHARD H. GUYER.

Witnesses:

CHARLES GROENENDYKE, WM. J. ATWELL.

